SFB 627: Nexus
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SFB 627: Nexus


Deutsche Version
The research agenda is divided into four domains. Domains A and B comprise projects dealing with the implementation aspects of the world model. Projects in domain A focus on issues concerning communications and security, whereas projects in domain B address issues of data modeling and data management. Project domain C combines projects working on the input and output of model information, therefore dealing with the "interface" of the federated world model to the real world. The tasks of these projects range from the retrieval of model information from sensors on one side to the presentation of information contained in the world model on the other side. Finally, project domain D comprises application-oriented projects whose research is based on the world model. In this domain there is also a project that is supposed to investigate the social aspects of the Nexus project by analyzing real applications. In the following, each project domain is briefly described. Each project in the table below is linked with a page describing it in greater detail.

Project Domain A Project Domain B Project Domain C Project Domain D Project Domain E
Context-Aware Communication Control Homogenized and Virtualized Model Management Consistency and Generalisation of 3D Geo Data Smart Factory Context aware Workflows
Context-aware Communication Hybrid Model Management Sensor-Supported, Context-Based, Consistency Analysis Context-Based Assistant Systems for People with Sensory Handicaps Semantic Methods
Security, Privacy and Accounting in Context-aware Systems Dynamic, Time-Referenced Model Data Context-Aware Mobile Visualization Reflection and Evaluation Distributed Situation Recognition based on Evaluated Context Information
Formal Methods     Influencing Factors of Demand Willingness of Location Based Services  

Project Domain A

Communication and security aspects will remain the predominant topics of this project domain. Starting from the results of the first project period we will focus on both, on communication aspects between mobile applications and the federation as well as the spatial model services and on the design of new communication mechanisms relying on the use of context information (Contextcast). In the area of security, comprehensive security solutions conforming with both, the security requirements of the users and the information demand of service providers (e.g. for accounting purposes), will be investigated. Model-checking methods will be applied in two areas: First, the status of authorization credentials in a highly distributed environment will be analyzed with the aid of efficient algorithms. Second, model checking methods will be used to monitor the spatial world model for prediction and verification purposes.

Project Domain B

The main task of this project domain is the development of concepts for the distributed management and provisioning of data of the world model. The world model contains location-based data and objects, which consist of partly proprietary data of different information providers and which are made available to applications in a unified representation and language. To provide this comprehensive information service, the subprojects of this project domain have to deal with problems of the system architecture, the federation and processing of data, and the quality and timeliness of data. The scalability and openness of the system architecture are especially important. In the second funding period, the requirements resulting from the provisioning of temporal, stream-based and three dimensional data are considered, in terms of management in dynamic infrastructures as well as in infrastructureless and hybrid systems.

Project Domain C

Project Domain C studies both the efficient processing of model data and the consistent preparation of acquired sensor data. This heterogeneous information should be consolidated, so that a consistent spatial world model can be generated from these semantic and sensory aspects. The analysis and quantification of fuzziness, uncertainness, incompleteness and impreciseness shall be applied to detect the cause of occurring inconsistencies and to provide appropriate methods for their solution. In addition, cost-benefit analysis for dissolving inconsistency will be developed, which will help to resolve the question if solving an inconsistency is worthwhile or if the respective application can handle the available inconsistent data in a meaningful manner. Other main research aims are the three-dimensional acquisition of object surfaces, the modelling of 3D point clouds and the generalisation of 3D city models. In particular, context-dependent generalisation and projections will be used. For the context sensitive visualisation of the spatial world model, user-oriented information visualisation methods are used.

Project Domain D

In this project domain applications are evaluated concerning ethical as well as economical aspects. The considered applications can only be developed on the basis of the Nexus technology. So mainly this project domain is thought to be a proof-of-concept of the Nexus vision in general, which serves at the same time as basis for a comprehensive evaluation concerning acceptability and profitability. The different application scenarios of the first funding period are deepened and enlarged thus offering a wide range of new research goals, potential use cases and newly emerging problems. Particularly sensor networks and context-depended data representation and communication should be investigated. As a result of the different research perspectives and the special requirements of the subprojects, interdisciplinary methods of resolutions and improvements for the Nexus concept are expected. For the new development, assessment and evaluation of the different application scenarios, special research on topics like acceptability, privacy, responsibility and accountability as well as on the economic potentials is essential.

Project Domain E

For the development of context aware applications, new approaches and concepts are necessary that take into consideration the information about the characteristic properties of the applications (e.g. mobility, context quality and heterogeneous system environments). Having discussed architectures of application environments during the past years, the second research period now focuses on architectures and functionalities as well as the generation of context aware applications. These applications require further information in addition to the context data that has been used so far. Therefore, the new project domain E has been established which deals with the generation of components for the derivation of such information. The three main topics are: the identification of complex situations, the accumulation of natural language context information from text modules that can be found in the World Wide Web and the creation of software architectures and development tools for context aware applications. The subprojects give support to the application related projects of project domain D.

To the projects of the first period.